With a UV index reaching up to 5.9 in Hanoi, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
Read more here about the climate and sun exposure in and around Hanoi.
The UV index in Hanoi (Vietnam) can range from moderate to high levels throughout the year. During the summer months (May to September), when the sun is intense, the UV index often reaches levels above 9 (very high), posing a significant risk of skin damage. It is important to use sunscreen, wear protective clothing, and seek shade during this time.
Hanoi experiences four distinct seasons. Spring (March to April) is mild and pleasant, with temperatures averaging around 20-25 °C (68-77 °F). Summer (May to September) is hot and humid, with temperatures soaring above 30 °C (86 °F) and occasional rain showers. Autumn (October to November) brings cooler temperatures around 20-25 °C (68-77 °F) and drier weather. Winter (December to February) is cold with temperatures dropping to around 10-15 °C (50-59 °F).
Compared to other cities in the region, Hanoi has a relatively high sun exposure due to its location closer to the equator. This means that the UV rays are stronger, increasing the risk of sunburn and potential skin damage. It is vital to take precautions by using sun protection measures, even on cloudy days, to minimize the harmful effects of UV radiation.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Hanoi. It's designed to provide you with a better understanding of the yearly weather and sun exposure.